No problem on migrating purchase discussion to trade!
I do have this thing (which makes the 5-pin adapter into 2 of the 3-pin ones)
I do note in your more detailed readme that the 3-pin is considered “input” and the other connectors are considered output, so I’m not sure I could just plug both Of this into each EXI[S]T’s 3-pin…one of them might be reversing the transformer in the path?
EDIT: sorry being dense! I get it now, the inputs connect to your 1u tile (or mixup) the outputs are meant to connect to 1/4” so that won’t work.